Improvement in attrition-mills



J. J. HAYES. Attrition-Mill.

No. 214,295. Patented April 15, 1879.

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UNITED STATES PATENT ()FFIGE.

JOHN J. HAYES, OF GREEN POINT, NEW YDRK.

IMPROVEMENT IN ATTRlTlON-MILLS.

Specification forming part of Letters Patent No. 214,295, dated April 15, 1879; application filed August 5, 1878.

To all whom it may concern:

Be it known that I, JOHN J. HAYES, of Green Point, in the county of Kings and State of New York, have'invented certain Improvements in Attrition-Mills, whereof the following is a specification.

This invention relates to machines for pulverizing quartz, minerals, and metallic ores, wherein a number of revolving heaters act upon the material when fed thereto in a suitable ease, the comminution being effected by the attrition of the pieces or particles upon each other.

The improvements consist, essentially, of a new heater and means of securing the same in the machine, and these combined with a case having a lining of hard or hardened metal.

In the annexed drawings, Figure 1 shows the heaters as affixed to the usual projections or holders upon the periphery of a revolving disk within its case. Fig. 2 is a side View of one of the heaters, enlarged, showing means for securing the heater in place. Fig. 3 is a face view of parts shown in Fig. 2.

A represents a circular case of the usual form and construction in this class of mills. B B are the heaters, which are made of indiarubber or other elastic material. C G are projections on the periphery of a disk, D, to which the heaters are made fast. The disk D is caused to revolve within the case A by any suitable power at very high speed, usually about twenty-five hundred to three thousand revolutions per minute.

The body of the disk is thinner and smaller than the interior of the case; but the projections 0, for carrying the heaters, are broad and high enough nearly to touch the inner surfaces of the case, reaching in afull-sized machine to within, say, one inch from the side surfaces, and half an inch from the lining 4 on the inner periphery thereof.

Hitherto it has been the practice to use heaters of very hard or hardened metal. That, however, fails to answer the purpose, the beaters wearing away so much in a few days use, particularly at the outer corners or edges thereof, as to render the heaters worthless and necessitate their renewal.

After a long series of costly experiments I found india-rubber to answer best, preferring v vulcanized rubber, but in a nearly pure state. It consists of a section of the elastic material of about one inch in thickness and about the dimensions otherwise of the projections O on the disk D. Such heaters I secure by any competent means to the said disk D, placing one in front of each of the projections (1, which are for the purpose of carrying the heaters around.

The means shown in the drawingsfor securing the heaters consist of metallic surfaces, between which the heater is placedthat is to say, plates 3 5through which and the heaters is passed a bolt, which enters the projection 0, and is held by a nut at the back. The plate 3 behind each beater rests against and may be esteemed part of the said carrier or projection. It has a lip turned up at its outer edge to sustain the outer edge of the heater and prevent its extension outwardly by centrifugal force; and such plate or surface also sustains or supports the side edges of the heater and enables it to successfully resist the impact of the material being operated upon against the beater as the latter is revolved. The heater may be vulcanized directly on or otherwise secured to the said plate.

The plate 5 in front of each heater is made of smaller dimensions than the beater, so as to expose the surface of the heater for operation upon the material being pulverized, and has points or claws on its under surfacemade in this instance by bending down the corners of the plate-which claws hold the beater against the drawing action of the pieces of material in process of comminutiou as the heaters pass them during the rapid revolution of the latter within the case.

In this mode of securing the heaters the central portion thereof acts as a cushion to the plates 5 and bolt-heads, permitting them to yield, and so enhancing their durability.

It is, however, possible to dispense with the plates 5 and substitute india-rubber, and the faces of the projections 0 may be shaped like case.

In practicing the foregoing invention the details may be variously modified, while preserving the essential characteristics thereof.

I claim as my invention-- 1. In attrition-mills, the elastic or yielding beaters A, in combination with and sustained upon an unyielding plate, 3, or equivalent supporting-surface.

2. ln attrition-mills, the combination, with the revolving disk D, of elastic or yielding beaters A, and means of securing such heaters to the projections or carriers 0 of such disk.

3. In attrition-n1ills,a heater or heaters composed of india-rubber or other elastic material embraced between metallic surfaces, which leave a marginal face of the elastic substance exposed.

4. The combination, with beaters A of elastic material, of the plates 3 and 5 on both sides of the body A of the beaters, and the whole secured to the revolving disk by fasteningbolts passing through the heaters and plates and into the projections G, as set forth.

5. The lining for the inner surface of the case A, consisting of hard or hardened metal, in combination with elastic or yielding heaters.

JOHN J. HAYES.

Witnesses:

EARLE H. SMITH, PETER DWYER. 

